Submission #550275

#	Time	Username	Problem	Language	Result	Execution time	Memory
550275		Hanksburger	Global Warming (CEOI18_glo)	C++17	100 / 100	58 ms	4256 KiB

glo

#include <bits/stdc++.h>
using namespace std;
int a[200005], lis[200005];
vector<int> vec;
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, m, ans=0;
	cin >> n >> m;
	for (int i=1; i<=n; i++)
	{
		cin >> a[i];
		int index=lower_bound(vec.begin(), vec.end(), a[i])-vec.begin();
		if (index==vec.size())
			vec.push_back(a[i]);
		else
			vec[index]=a[i];
		lis[i]=index+1;
	}
	vec.clear();
	for (int i=n; i>=1; i--)
	{
		int index=lower_bound(vec.begin(), vec.end(), -a[i]+m)-vec.begin();
		ans=max(ans, lis[i]+index);
		index=lower_bound(vec.begin(), vec.end(), -a[i])-vec.begin();
		if (index==vec.size())
			vec.push_back(-a[i]);
		else
			vec[index]=-a[i];
	}
	cout << ans;
	return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:16:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |   if (index==vec.size())
      |       ~~~~~^~~~~~~~~~~~
glo.cpp:28:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   if (index==vec.size())
      |       ~~~~~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25